(Apache) Keep slashes encoded for the API

> If using namespaced projects call make sure that the NAMESPACE/PROJECT_NAME
> is URL-encoded, eg. /api/v3/projects/diaspora%2Fdiaspora
> (where / is represented by %2F).
http://doc.gitlab.com/ce/api/projects.html#get-single-project
Merge pull request #231 from GromNaN/patch-1

[Apache] Keep slashes encoded for API